<?php

namespace App\Controllers\Api;

use CodeIgniter\RESTful\ResourceController;
use CodeIgniter\HTTP\ResponseInterface;

class BaseApiController extends ResourceController
{
    protected $format = 'json';
    protected $db;

    // DB lazy loading
    protected function getDB()
    {
        if (!$this->db) {
            $this->db = \Config\Database::connect();
        }
        return $this->db;
    }

    /**
     * Success response
     */
    protected function respondSuccess($data = null, $message = 'Success', $code = ResponseInterface::HTTP_OK)
    {
        return $this->respond([
            'success' => true,
            'message' => $message,
            'data' => $data
        ], $code);
    }

    /**
     * Error response
     */
    protected function respondError($message = 'Error occurred', $code = ResponseInterface::HTTP_BAD_REQUEST, $errors = null)
    {
        return $this->respond([
            'success' => false,
            'message' => $message,
            'errors' => $errors
        ], $code);
    }

    /**
     * Get Authorization header from various sources
     */
    protected function getAuthHeader()
    {
        // Try standard Authorization header
        $authHeader = $this->request->getHeaderLine('Authorization');

        if (!empty($authHeader)) {
            return $authHeader;
        }

        // Try from $_SERVER (Apache mod_rewrite)
        if (isset($_SERVER['HTTP_AUTHORIZATION'])) {
            return $_SERVER['HTTP_AUTHORIZATION'];
        }

        // Try from $_SERVER with REDIRECT_ prefix
        if (isset($_SERVER['REDIRECT_HTTP_AUTHORIZATION'])) {
            return $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
        }

        // Try from getallheaders() if available
        if (function_exists('getallheaders')) {
            $headers = getallheaders();
            if (isset($headers['Authorization'])) {
                return $headers['Authorization'];
            }
            if (isset($headers['authorization'])) {
                return $headers['authorization'];
            }
        }

        return null;
    }

    /**
     * Validate token
     */
    protected function validateToken()
    {
        $authHeader = $this->getAuthHeader();

        if (empty($authHeader)) {
            return false;
        }

        $token = str_replace('Bearer ', '', $authHeader);

        if (empty($token)) {
            return false;
        }

        // Check token in database
        try {
            $builder = $this->getDB()->table('admin_tokens');
            $tokenData = $builder->where('token', $token)
                                 ->get()
                                 ->getRow();

            if (!$tokenData) {
                return false;
            }

            // Check expiration (만료 체크)
            $expiresAt = strtotime($tokenData->expires_at);
            $now = time();

            if ($expiresAt < $now) {
                return false;
            }

            return $tokenData;
        } catch (\Exception $e) {
            log_message('error', 'validateToken error: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * Require authentication
     */
    protected function requireAuth()
    {
        $authHeader = $this->getAuthHeader();

        // 디버깅: Authorization 헤더 확인
        if (empty($authHeader)) {
            return $this->respondError('No Authorization header', ResponseInterface::HTTP_UNAUTHORIZED);
        }

        $token = str_replace('Bearer ', '', $authHeader);

        if (empty($token)) {
            return $this->respondError('Empty token', ResponseInterface::HTTP_UNAUTHORIZED);
        }

        $tokenData = $this->validateToken();

        if (!$tokenData) {
            return $this->respondError('Token validation failed - token: ' . substr($token, 0, 20) . '...', ResponseInterface::HTTP_UNAUTHORIZED);
        }

        return $tokenData;
    }

    /**
     * Get pagination params
     */
    protected function getPaginationParams()
    {
        $page = $this->request->getGet('page') ?? 1;
        $perPage = $this->request->getGet('per_page') ?? 10;
        $offset = ($page - 1) * $perPage;

        return [
            'page' => (int)$page,
            'per_page' => (int)$perPage,
            'offset' => (int)$offset
        ];
    }

    /**
     * Build paginated response
     */
    protected function paginatedResponse($builder, $params)
    {
        $total = $builder->countAllResults(false);
        $items = $builder->limit($params['per_page'], $params['offset'])->get()->getResult();

        return [
            'items' => $items,
            'total' => $total,
            'page' => $params['page'],
            'per_page' => $params['per_page'],
            'total_pages' => ceil($total / $params['per_page'])
        ];
    }

    /**
     * Fix localhost URLs to current domain URLs
     */
    protected function fixUrl($url)
    {
        if (empty($url)) {
            return $url;
        }

        // 현재 요청의 도메인 감지
        $protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https://' : 'http://';
        $currentDomain = $protocol . ($_SERVER['HTTP_HOST'] ?? 'localhost');
        $currentBaseUrl = rtrim($currentDomain, '/') . '/';

        // localhost 또는 127.0.0.1로 시작하는 URL을 현재 도메인으로 변경
        $patterns = [
            'http://localhost:8080/',
            'http://localhost/',
            'https://localhost:8080/',
            'https://localhost/',
            'http://127.0.0.1:8080/',
            'http://127.0.0.1/',
            'https://127.0.0.1:8080/',
            'https://127.0.0.1/',
        ];

        foreach ($patterns as $pattern) {
            if (strpos($url, $pattern) === 0) {
                $url = str_replace($pattern, $currentBaseUrl, $url);
            }
        }

        // writable/uploads 경로를 uploads로 변경 (심볼릭 링크 대응)
        $url = str_replace('/writable/uploads/', '/uploads/', $url);
        $url = str_replace('writable/uploads/', 'uploads/', $url);

        return $url;
    }

    /**
     * Fix URLs in object/array
     */
    protected function fixUrls($data, $fields = ['image_url', 'file_url', 'url'])
    {
        if (is_object($data)) {
            foreach ($fields as $field) {
                if (isset($data->$field)) {
                    $data->$field = $this->fixUrl($data->$field);
                }
            }
        } elseif (is_array($data)) {
            foreach ($data as &$item) {
                $item = $this->fixUrls($item, $fields);
            }
        }

        return $data;
    }
}